class_docstr: IODescriptor describes the input/output data format of an InferenceAPI defined
  in a :code:`bentoml.Service`. This is an abstract base class for extending new HTTP
  endpoint IO descriptor types in BentoServer.
code: def mime_type(self) -> str:
      return self._mime_type
  
imports: from __future__ import annotations
  import typing
  from abc import ABC
  from abc import abstractmethod
  from functools import update_wrapper
  from ...exceptions import InvalidArgument
label_desc: Use image node_id 6 for calling the IODescriptor obj's underlying member method code with example usage: obj.mime_type() and returns: self